CONTENTS 
PAGES 
1 
Introduction, 
Literature of the Subject, . . . . . . . . . 3, 4 
List of the Species of Heteropoda obtained by the Challenger, .... 5 
Synonymy of the Families, Genera, and Species of Heteropoda, Critical Observations 
respecting the Value of certain Genera and Species, and Descriptions of some of the 
Specimens obtained by the Challenger, ....... 7-47 
Family I. Pterotracheidae, ......... 9-37 
Pterotrachea, Forskal, ......... 10-19 
Firoloida, Lesueur, ......... 20-25 
Cardiopoda, d’Orbigny, ......... 25-28 
Carinaria, Lamarck, ......... 28-37 
Family II. Atlantidse, .......... 37-47 
Atlanta, Lesueur, .......... 38-45 
Oxy gyrus, Benson, .......... 45-47 
Index of Systematic Names, ......... 49 
